How to validate a text field on a form

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Reference no: EM1332473

Write a JavaScript function - included in a XHTML document - to validate a text field on a form which is to contain an integer, eg 2, 4567, 87612 etc ... without using any built functions like IsNaN an so fourth. If the text field contains a valid number then the JavaScript function can return "true", otherwise it returns "false" as well as displaying a popup error message.

Reference no: EM1332473

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